Abstract: A coilable length of insulating material adapted to be set up for forming a duct to contain wire-like members extending along its length, wherein the length has a plurality of spaced apart longitudinally extending scores, the space between the scores defining top and bottom and side walls of the duct, and a adhesive strip arranged along the length for securing the walls of the duct set up when connected between at least two of the walls. A wall overlying the top wall may be adhesively secured to it for securing the duct in set up position. The length may be cut to any desired length. The length may also have another adhesive strip along one of the walls for securing the set up duct to a selected surface. The duct may be mitered by cutting it laterally for tracking corners and non-planar surfaces. The invention also relates to the method for making and setting up such a duct.